Vox Amplification’s new AV-series comprises three affordable guitar combos. The Vox AV15, AV30 and AV60 – named according to their power amp wattage – are modelling valve hybrid amplifiers that combine the best elements of solid state and tube technology.

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KitarablogiDotCom took the smallest of the trio, the Vox AV15 (street price in Finland approx. 269 €) for a spin.

The combo’s cabinet has taken a big leaf out of the book of hi-fi speaker construction. Normally a guitar cab is meant to add its own bit of tonal modification into the mix, but when dealing with a modelling amplifier meant to imitate a number of different amp and speaker configurations, the more linear frequency response of a bass reflex cabinet is highly desirable.

The only thing you’ll find on the Vox AV15’s back panel is the connector for the amp’s external power supply unit (12 VDC, included).

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The Preamp Circuit-switch lets you select one of the eight amp models offered by the Vox. The selection takes you from Fender Twin-style cleans, and Vox- and Marshall-type crunch, all the way to Rectifier-like high gain tones.

You can fine-tune your tone using the three-band EQ section. The AV15 also comes equipped with an effects section made up of three different effects – reverb, delay and chorus (called modulation on the front panel). You are free to choose any or all of the effects. Each effect allows you to control a second parameter (in addition to the effect level) by keeping the respective effect’s effect button depressed while turning the Effects-control. You can change the modulation speed of the chorus, the delay time for the delay effect, and the length of the reverb tail of the reverb effect. The effects are the only digital bits in the AV-combo’s architecture, the rest of the Vox’ signal path – including the amp modelling – is kept all-analogue.

It may seem a bit unusual, but the AV15 features three different ”volume controls”, which all have a different bearing on the combo’s sound:

The Gain-knob sets the signal level before the signal is sent to the preamp’s valve stage. Low Gain settings result in a clean sound, while higher Gain settings will lead to preamp break-up and (depending on the chosen amp model) distortion. The Volume-control adjusts the signal level right in front of the power amp’s tube stage. Lower Volume settings will give you a clean and dynamic signal, while higher settings will bring in some power amp compression and saturation (= distortion). The last volume knob – called Power Level on the Vox AV15 – determines the final volume level in your room (or in your headphones).

While its bigger siblings – the AV30 and the AV60 – feature two valves in their architecture (one for the preamp, one for the power amp), the smaller Vox AV15 makes do with just a single tube for both pre- and power amp duties. This is made possible by the way the good-old 12AX7-valve is constructed, offering you two triodes in one single tube. This means, you can split this valve type to perform two jobs simultaneously.

This Vox’ Valve Stage-section features four small slider switches that you can use to modify the way the two valve stages react and sound:

The Pre Amp side of things sports a Bright-switch for adding sparkle to your top end, as well as a Fat-switch that will boost the bass response.

The switches labelled ”Power Amp” really do make a significant difference to this combo’s ”feel”. The Bias- and Reactor-switches let you select how much the power amp’s tube section is ”pushed” and how much power amp compression will be audible.

Listen to these two sound clips – clean and crunch – to get an idea of how the Valve Stage switches change the combo’s sound (Gibson Les Paul Junior, Shure SM57). Both clips start with all the switches in the left position. Then I put one switch after the other to its right position (starting with the Bright-switch, and continuing left to right):

But in our heart of hearts, most of us ”old farts” would have been more than happy, if we would have had such a great-sounding and versatile amp as the Vox AV15 when we started playing in the 1970s and 80s! The AV15 really wins you over with its array of inspiring tones and its affordable price tag.

The Vox AV15 is a real amp, not a plastic toy sucking all of the sheer joy of playing out of an eager novice. Vox AV-series hybrid combos can also serve more advanced players as fun living room amps, they can be used for backstage warm-up, and they also make a good figure as home studio amps (as you can hear in the demo songs).

The larger Blackstar ID:Core 40 combo (current price in Finland:195 €) uses two 6.5-inch speakers to get its message across.

Except for the differences in power amp-, cabinet- and speaker-sizes, the rest of the specifications are identical in these two guitar combos. To make this review more readable I will concentrate on the Blackstar ID:Core 40, and mention any possible differences found in the ID:Core 20.

The new Blackstar combo has a very handy size, and it is easy to carry. In addition to the carrying strap, you will find the power supply unit and a quick start guide in the shipping box. You can download the full owner’s manual as a PDF-file from Blackstar’s website or HERE.

Even though the ID:Core series, naturally, isn’t really built to withstand the rigours of touring, these combo’s are rather sturdy little numbers. These may be mere practice amps, but toys they are most definitely not!

The electronics have been installed into the ID:Core’s top.

All the controls, push-buttons and inputs/outputs are identical throughout the whole series, with the exception of the smallest combo (the ID:Core 10) not offering the option of connecting a FS-11 footswitch unit (not included).

The ID:Core 40’s factory default uses the FS-11’s left switch for switching between two Voice-channels, with the right switch functioning as an effect mute for the selected channel.

The free Blackstar Insider -software (PC and Mac) also lets you select a different footswitch mode that offers you all Voice-channels, and which uses the two switches to step through all the channels, either up (right switch) or down (left switch).

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The ID:Core 40 is very easy to use:

The Voice-selector lets you choose one of the combo’s six Voice-channels (= digital amp models). In Preset-mode calling up a channel automatically recalls all the stored preset settings, like gain, ISF or effects. In Manual-mode switching to a different Voice only changes the selected amp type, with the other settings staying the way you have manually set them.

Naturally, all presets can be adjusted by the user, and the changes can then be stored in the ID:Core combo’s memory, wiping the factory preset in the process.

The new Blackstar-combos also come equipped with a digital tuner, which springs to life when you hold down the Manual- and Tap-buttons simultaneously for a couple of seconds. In Tuner-mode the combo’s red Voice-LEDs represent the six guitar strings, while the LEDs in the Effect-buttons tell you whether the pitch is flat (REV), sharp (MOD) or right on the money (DLY).

By downloading Blackstar’s Insider-software you get access to additional features of the ID:Core combo via its mini-USB-port (Hey, Blackstar: Why isn’t a USB-cable included with the amp?):

The most crucial of the additional functions, in terms of the combo’s tone, is the access to its internal three-band EQ. The combo only offers you a physical knob for the ISF-setting, which lets you change the amp’s character from bright-ish ”American” (ISF = 0) to chunkier ”British” (ISF = 10). The Insider-programme also lets you fine-tune each preset’s Bass, Middle and Treble EQ-settings.

Insider also allows you to create you own ID:Core-presets, save as many as you like, and send them to your combo for use. But note that each preset is always tied to the Voice-channel used as its basic ingredient. This means that an ID:Core combo will always offer six different Voice-channels – you cannot load six different Warm Clean patches, or six OD1 Metal sounds, into the combo’s six Voice-channels.

If you want, you can set up an Insider-account, which enables you to share your own patches with other ID:Core users around the globe.

The Blackstar Insider software also includes some tools for practicing. There’s a simple rhythm box, as well as a music player (looking like an old cassette recorder), which even allows you to change a music file’s tempo and/or loop a certain part.

Insider’s tuning section gives you an on-screen, graphically-enhanced version of the combo’s internal tuner.

Thanks to its USB-connectivity you can also use the ID:Core combos as an external sound-card for direct recording to your audio sequencer. You can even configure the combo for re-amping (using the Insider-software), but I wasn’t quite satisfied with the way the ID:Core performed as a sound-card (at least with the tested firmware version). I’d like to see an even shorter audio latency, as well as a hotter audio signal, before I would seriously consider using the ID:Core for direct recording.

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Blackstar’s advertisements are placing quite a lot of emphasis on the ID:Core series’ Superwide Stereo function. With Superwide Stereo turned on (factory default, you can also switch it off via Insider) especially the delays and reverbs sound impressively lush. You feel enveloped in a cloud of sound, with some of it seeming to even come from behind you.

Actually, the ID:Core’s effects aren’t really stereophonic at all – you shouldn’t expect ping-pong delays, or anything of that sort. In reality, these Blackstar combos have a signal path that is completely monophonic, up to the point the signal reaches the power amp section (and headphone amp). It is only at this point that a stereo signal is created from the mono by splitting the mono signal in two, and by changing the phase of one of the signals. The result is a lush, broad, and fairly natural ”stereo” sound.

This method of creating ”fake stereo” has long been used in analogue modulation effects. There’s nothing ”wrong” or ”deceitful” in doing things this way, and Blackstar’s Superwide Stereo sure sounds impressive, but I’m not sure I’d want to trumpet this amp series’ ”stereo-ness” so loudly.

But now to the most important aspect of an amp – it’s tone:

I could sum it all up by saying that the amps sound great! Regardless of the fact that we’re talking about very pocket-friendly practice amps here, the sounds and dynamic response Blackstar’s excellent ID-modelling technology dishes out will leave you with a big grin on your face. Six well-chosen Voices and 12 quality effect types shouldn’t leave anybody wanting.

The ID:Core 40, naturally, sounds noticeably ”bigger”, compared to the ID:Core 20, with its smaller speakers and cabinet. Nonetheless, you get the feeling that both combos make the most of their respective wattage. Miked up both combos sound virtually the same.

The following sound clips have been recorded with the Blackstar ID:Core 40, using the factory presets as a basis, which I then fine-tuned to my liking. I played these clips on my Kasuga (a Japanese ES-335 copy from the Seventies), recording the sound with two dynamic Shure microphones.

Blackstar have successfully managed to transfer the great sounds of their ”grown-up” ID Series amps to the ID:Core practice combos. Together with Blackstar’s Insider-software, the ID:Core 20 and ID:Core 40 combos are fully-spec’ed and inspiring tools for practice, home recording, teaching and warm-up. You get genuine Blackstar tone in a handy package!

Roland’s popular Cube-series of COSM-combos has recently been updated.

The new Cube GX-amps boast some new features, like the iCube Link (first seen in the Cube Lite), which allows you to use the guitar combo as a soundcard with Apple iOS devices.

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The Roland Micro Cube GX (current price in Finland 134 €) is the newest version of one of the most successful battery-powered practice amps ever.

At first glance the GX-version looks very similar to the Micro Cube’s previous incarnation, with only the large Cube logo on the metal grille hinting at the combo’s updated status.

The Micro Cube GX’ back panel is a good deal smaller than on the last version.

The new combo sports mini-sized headphone and line-level outputs.

The GX still runs on six AA-batteries, but the new battery compartment is much easier to use.

A power supply can be found in the box.

The front panel has gotten a serious overhaul:

Above the guitar input you can find the i-Cube Link connector, which allows you to hook up you iPad or iPhone to the combo using the supplied cable. Thanks to the i-Cube Link you can use the GX-amp as the iDevice’s sound-card, as well as record and practice using Roland’s free Cube Jam-app. You can get more info on the Cube Jam-app in Kitarablogi’s Cube Lite review.

Another important new feature of the Micro Cube GX is the Memory-function, which offers you one memory slot per COSM Amp Type. Memory stores all settings of the chosen Amp Type, namely the settings of the Gain-, Volume-, EFX- and Delay-controls.

The tuner section has also received an overhaul. The old Micro Cube came with an electronic tuning fork on-board, giving you an ”a” (or Ab or Abb) to tune to. The brand-new Micro Cube GX comes equipped with a genuine digital tuner. The default setting for the tuner is chromatic, but it can also be set to A-only, which comes in handy when changing strings.

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The Roland Cube-80 GX (current price in Finland 384 €) is the current top model in the GX-series, offering you 80 Watts of output power through a single 12-inch speaker.

The clearest difference between the predecessor – the Cube-80 XL – and the GX-version is the addition of the i-Cube Link in favour of the old model’s built-in looper.

Also new is the GA-FC-connector on the amp’s back panel, which allows you to use Roland’s guitar amp foot-controller the GA-FC (optional) with the Cube-80 GX.

This is what the foot-controller looks like. When used with the GX, you can switch amp channels and turn the combo’s EFX-, Delay- and Reverb-sections on/off separately. You can also connect two expression pedals to the GA-FC, if you want to adjust input and output levels on the fly. The Cube-80 GX comes supplied with a special overlay for the foot-controller, so you can change the GA-FC’s labelling to match the correct functions.

Some things have stayed the same, though, like the rugged design of the Cube-series.

The Cube-80 GX is a three-channel guitar amplifier:

The JC Clean-channel is reserved for ultra-clean tones in the style of Roland’s legendary Jazz Chorus-combo. The Lead-channel, on the other hand, offers you nine different COSM-models, as well as an acoustic simulator for your occasional steel-string needs.

The third channel is the so-called Solo-channel. I say ”so-called”, because actually the Solo-channel is the Cube-80 GX’ memory slot, which you can fill with any amp setting you wish, regardless of whether it is a setting for soloing or not. The crucial difference between the Solo-channel and the other two channels is the fact that the Solo-channel uses its own (stored) settings for the EQ-, EFX-, Delay- and Reverb-sections, while JC Clean- and Lead-channels have to share the current control settings.

Apart from the i-Cube Link, the Cube-80 GX’ features list is very similar to the Cube-80 XL-version. You can get more info on the i-Cube Link and Roland’s free Cube Jam-app in Kitarablogi’s Cube Lite review.

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Roland’s brand-new Micro Cube GX offers you even more than its already legendary predecessor. The built-in tuner makes life much easier, and the new i-Cube Link/Cube Jam functionality genuinely adds value to this diminutive powerhouse. If you own an iDevice you will have your own practice set-up up and running in no time.

The little GX-combo also gives you three new sounds – the fantastically über-Metal amp type called Extreme, a fine polyphonic octaver effect, as well as a spring reverb model. The Micro Cube GX’ spring reverb simulation sounds good, but very small area designated for it on the Reverb-control doesn’t allow for much in terms of tailoring the spring reverb. It’s more of an on/off affair.

Overall the GX sounds better than the original Micro Cube, with more realistic amp simulations and clearly less hiss in the effect section.

These four clips have been recorded using a dynamic mic in front of the combo, and playing a Fender Stratocaster:

Roland’s new Cube-80 GX is a compact, yet powerful guitar combo for the gigging guitarist.

The sounds on offer cover all bases, and the amp types and effects all sound great. Depending on your guitar of choice there can be a very slight tendency toward a crowded lower-midrange – especially with clean sounds – but this can be easily kept in check with the amp’s nice EQ-section.

I feel that if you want to use the Cube-80 GX live, buying the GA-FC-controller is almost compulsory, as it is the only way you can fully control all the combo’s functions on the fly. 100 euros seems a bit steep in relation to the Cube’s own price tag, but from a practical standpoint the additional outlay makes a whole lot of sense.

Be that as it may, Roland’s Cube-80 GX is a cool amp for both gigging and studio use.

These four examples have been recorded with the same set-up are the Micro Cube GX-clips:

Roland’s Cube GX-series is a good choice if you want a wide variety of different amp tones and effect sounds to choose from. For teaching and/or practising purposes the iOS-compatibility and Roland’s own Cube Jam-app add a lot of value to an already very enticing package.